C 6.57 ) 
IL What a Compleat Treatife of Navigation 
fhonld contain. Drawn up in the Tear 1685* 
by Sir William Petty late Fellow of the Royal 
Society. 
l. ¥ TT THat Arithmetick in whole Numbers and Fra* 
VV (ftions, as alfo in Decimals and Logarithmes, 
is neceflary for the fame 1 And what Books are beft for 
teaching fo much thereof > 
z. What Vulgar Tragical Mechanical Geometry per- 
formable by the Scale and Compafs is fufficient ? 
3. What Trigonometry, Right Lined, and Spherical 
will fuffice l 
4. How many Stars are to be known > 
5. What Inflruments are beft for ufe at Sea, with the 
Conftrudtion of .them, and the manner of ufing them ? 
6. The whole Skill of the Magnet, as to the dire&ive 
Vermes thereof, and all the Accidents which may befall 
it. 
7. The Hydrography of the Globe of the Earth, the 
Perfpe&ive of the Coafts, and the Defcription of the 
under -water-bottom of the Sea. 
8. The knowledge of Winds and Meteors, fo far as 
the fame is attainable. 
9. TheHiftory and Skill of all forts of Fifpings. 
10. The Art of Medicine and Chyrurgery, peculiarly 
for the Sea. 
11. The Common Laws of the Admiralty > and Jh~ 
tifdittion of the Sea. 
12. The feveral Vtcluallings and C loathings, fit for 
Sea-men. 
13. The whole Science of Ebbing and Flowing, as al- 
io of Currents and Eddyes at Sea. 
O 14. V?>% 
